Limiting speed is an issue because it makes for a longer day on the road. Will do to increase range though.
Well, there are various points in the spectrum where different factors might be dominant though. And that does depend on Supercharger location and spacing and the size of your battery.
Going some really low speed like 50 mph yes, would add a lot of travel time to the trip. Going 60 or 70 or 72 mph would probably be quicker. But the wind resistance is an exponential factor, so people trying to push for going 82 or 86+ mph are going to have other problems of having to stop more often, and also charge longer and also charge up to higher battery percentages, which make the charging go slower, which make the stops even longer.
These are one of those that you kind of try out and find what's effective or comfortable for you.
Does it help reserve battery use to extend range between charges if I reduce the use of AC/Heat or radio?
I've done comments on here before about giving a numbered priority ranking of what makes a difference in use, and intentionally didn't use even spacing of the numbers to indicate how large the effect is in the ranking:
#1 Speed/wind resistance by far. This is the most significant thing, and turning your cruise control down by just a couple of miles an hour can make a big difference if you're talking about speeds in the 70's and 80's.
#1b A subcategory that is also basically the same as speed is anything that trashes your aerodynamics and creates more wind drag: trailer, bike racks, etc.
#10 Heating/cooling. Much less effect than speed. Before the heat pumps, the resistive heating could be a big factor. A/C was less, but still noticeable.
#1,000,000 Waaaayyyy down the list is everything else: stereo volume, windshield wipers, screen brightness, Bluetooth, etc. None of them will ever make any perceptible difference.
